So next upgrade for me will be a Apricorn velocity duo card to fit my Samsung 840 EVO 500gb in my cMP4.1, shortly to follow by a another SSD for a striped RAID array. Here is the thing. Looking at EVO drives the 840 EVO have been superseded by the 850 EVO and the new drives are cheaper even though they are newer? I don't get this. Options are. Get older + more expensive 840 disk Try get used 840 disk (used ssd's?) Use 840 + 850 Ive always thought using identical discs are preferred Please tell me what you think? BTW Does anyone know if there software to set up Stripe RAID on this card using a mac now? or do i have to set it up on a PC?